package utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

/**
 * Druid连接池的工具类
 */

public class JDBCUtils {
    //1.定义成员变量DataSource
    private static DataSource ds;

    static {

        try {
            //1.加载配置文件
            Properties pro = new Properties();
            pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
            //2.获取DataSource
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    /**
     * 获取连接
     */
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    /**
     * 释放资源
     */
    public static void close(Statement stmt, Connection conn) {
//        if (stmt != null) {
//            try {
//                stmt.close();
//            } catch (SQLException e) {
//                e.printStackTrace();
//            }
//        }
//            if (conn != null) {
//                try {
//                    conn.close();//归还连接
//                } catch (SQLException e) {
//                    e.printStackTrace();
//                }
//            }
        close(null,stmt,conn);
        }
    public static void close(ResultSet rs,Statement stmt, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (stmt != null) {
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();//归还连接
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    /**
     * 获取连接池的方法
     *
     */
        public static DataSource getDataSource(){
            return ds;
    }
    }
